package com.walleipt.ipt_tools.utils;

import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class Md5Encrypt {
	 /**
	  * Used building output as Hex
	  */
	 private static final char[] DIGITS = { '0', '1', '2', '3', '4', '5', '6',
	   '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };
	 /**
	  * 对字符串进行MD5加密
	  *
	  * @param text
	  *            明文
	  *
	  * @return 密文
	  */
	 public static String md5(String text) {
	  MessageDigest msgDigest = null;
	  try {
	   msgDigest = MessageDigest.getInstance("MD5");
	  } catch (NoSuchAlgorithmException e) {
	   throw new IllegalStateException(
	     "System doesn't support MD5 algorithm.");
	  }
	  try {
	   msgDigest.update(text.getBytes("utf-8"));
	  } catch (UnsupportedEncodingException e) {
	   throw new IllegalStateException(
	     "System doesn't support your  EncodingException.");
	  }
	  byte[] bytes = msgDigest.digest();
	  String md5Str = new String(encodeHex(bytes));
	  return md5Str;
	 }
	 public static char[] encodeHex(byte[] data) {
	  int l = data.length;
	  char[] out = new char[l << 1];
	  // two characters form the hex value.
	  for (int i = 0, j = 0; i < l; i++) {
	   out[j++] = DIGITS[(0xF0 & data[i]) >>> 4];
	   out[j++] = DIGITS[0x0F & data[i]];
	  }
	  return out;
	 }
	}
